Nissan Altima HL32 Hybrid. Manual - part 512

B2651, B2652 ELECTRIC COMPRESSOR

HAC-69

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B2651, B2652 ELECTRIC COMPRESSOR

Description

INFOID:0000000004215356

The temperature sensor of the electric compressor detects inverter temperature. If the temperature exceeds

the maximum, the electric compressor stops compressor operation, and this DTC will be output. The output

DTC of B2651 are memorized only present trouble. On B2652, compressor control may not resume unless the

ignition switch is turned OFF and waiting for 10 minutes.

DTC Logic

INFOID:0000000004215357

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON (READY) and wait at least 5 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to Diagnosis Procedure. 

HAC-69, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

INFOID:0000000004215358

1.

CHECK CAN COMMUNICATION SYSTEM

Use the CONSULT-III to check if the CAN Communication System is functioning normally.
Is CAN DTC detected?

YES

>> Check CAN communication. Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

NO

>> GO TO 2.

2.

PERFORM ACTIVE TEST

1. Turn ignition switch ON (READY).

2. Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
Does cooling fan operates smoothly?

YES

>> GO TO 3.

NO

>> Go to cooling fan system. Refer to 

EC-382, "Diagnosis Procedure"

.

3.

CHECK REFRIGERANT CYCLE PRESSURE

Connect refrigerant recovery/recycling recharging equipment to the vehicle and check the refrigerant cycle

pressure. Refer to 

HA-21, "HFC-134a (R-134a) Service Procedure"

.

Is the inspection result normal?

YES

>> GO TO 4. 

NO

>> Recharge refrigerant after repair or replace the parts according to the inspection results.

4.

CHECK DTC

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

B2651

INV OVERHEAT L

• After READY and A/C ON
• Temperature in the inverter is outside the 

specified range (temperature is too high), or 
there is an open or short to ground in the tem-
perature sensor circuit.

• Cooling fan system
• Refrigerant volume
• Electric compressor
• CAN communication system

B2652

INV OVERHEAT S

HAC-70

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

B2651, B2652 ELECTRIC COMPRESSOR

Check DTC.

NOTE:

If the engine keeps idling when ambient temperature is high, the compressor may automatically stop to protect

the inverter circuit, and DTC B2651, B2652 may be stored.
Is DTC B2651, B2652 detected?

YES

>> Replace electric compressor. Refer to 

HA-31, "Removal and Installation"

.

NO

>> END.

P0AA6-611 ELECTRIC COMPRESSOR

HAC-71

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

P0AA6-611 ELECTRIC COMPRESSOR

Description

INFOID:0000000004215359

The DTC is output if there is insulation trouble with the high-voltage circuits in the air conditioning system.

Possible causes are poor insulation in the compressor with motor assembly, or mixing of any oil other than

ND-OIL 11 in the refrigerant cycle. The motor driven with high-voltage is built into the electrical compressor

and is cooled directly with refrigerant. Compressor oil (ND-OIL 11) with high insulation performance is used

because a leakage of electrical power may occur if regular compressor oil (DH-PS or DH-PR) is used.

CAUTION:

• Electrical insulation performance may decrease significantly if even a small amount of oil other than

ND-OIL 11 is used (or enters) in the refrigerant cycle, causing the DTC to be output.

• If other oil is accidentally used and a DTC is output, collect the oil in the refrigerant cycle into the

compressor and replace it with ND-OIL 11 to increase the ND-OIL 11 ratio amount.

• Replace the main components (evaporator, condenser, and compressor) if a large amount of oil

other than ND-OIL 11 enters the system. Failing to do so may cause electrical insulation perfor-

mance to remain low, causing the DTC to be output.

• Wear insulated gloves and pull out the service plug grip before inspection as procedures may

require disconnecting high-voltage connectors.

• Be sure to carry the removed service plug grip because other workers may install it by mistake.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is

removed.

DTC Logic

INFOID:0000000004215360

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON (READY) and wait at least 5 seconds.

2. Check DTC.
Is DTC detected?

YES

>> Go to Diagnosis Procedure. 

HAC-71, "Diagnosis Procedure"

.

NO

>> END.

Diagnosis Procedure

INFOID:0000000004215361

CAUTION:

• Wear electrically insulated gloves and pull out the service plug grip before inspection as procedures

may require disconnecting high-voltage connectors. Be sure to carry the removed service plug grip

because other workers may install it by mistake.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is

removed.

NOTE:

If it can be confirmed that any compressor oil other than ND-OIL 11 has been used in the vehicle, replace the

air conditioning cycle.

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P0AA6-
611

INSULATION RESIST

• After READY and A/C ON
• High voltage system insulation malfunction.

• Compressor oil
• Refrigerant pipe line
• Electric compressor
• CAN communication system

HAC-72

< COMPONENT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

P0AA6-611 ELECTRIC COMPRESSOR

1.

CHECK CAN COMMUNICATION

Use the CONSULT-III to check if the CAN Communication System is functioning normally.
Is DTC detected?

YES

>> Check CAN communication. Refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

NO

>> GO TO 2.

2.

INSPECT ELECTRIC COMPRESSOR

1. Turn ignition switch ON.

2. Select “SELF-DIAG RESULTS” mode with CONSULT-III.

3. Touch “ERASE”.

4. Turn fan control dial clockwise. Blower should operate on max. speed.

5. Turn temperature control dial (driver side) counterclockwise until 18

°C (60°F).

6. A/C switch ON, and operate more than 3 minutes.

7. Turn ignition switch OFF.

8. Remove the service plug grip.

CAUTION:

• Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the ser-

vice plug grip to cut off the high-voltage circuit before inspection.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip

is removed.

• Do not start the engine with the service plug grip removed because it may cause a malfunction.

9. Disconnect electric compressor connector.

10. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

Is DTC detected?

YES

>> GO TO 3.

NO

>> Replace electric compressor. Refer to 

HA-31, "Removal and Installation"

.

3.

INSPECT ELECTRIC COMPRESSOR

1. Reconnect electric compressor connector.

2. Install the service plug grip.

CAUTION:

• Because the compressor has a high-voltage circuit, wear insulated gloves and pull out the ser-

vice plug grip to cut off the high-voltage circuit before inspection.

• Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip

is removed.

• Do not start the engine with the service plug grip removed because it may cause a malfunction.

3. Turn ignition switch ON.

4. Turn temperature control dial (driver side) clockwise until 25

°C (77°F).

5. Turn fan control dial counterclockwise. Blower should operate on low speed, and then operate the com-

pressor for 10 minutes to circulate the refrigerant cycle with refrigerant and collect as much compressor oil

as possible.

6. Turn ignition switch OFF.

7. Using a spot cooler or other tools, cool down the compressor with motor assembly for 30 minutes, or

leave the vehicle overnight before inspection.

CAUTION:

Do not operate the compressor before inspection.

8. Remove the service plug grip.

CAUTION:

Do not start the engine with the service plug grip removed because it may cause a malfunction.

9. Disconnect electric compressor connector.

10. Using a megohmmeter, measure the resistance according to the value(s) in the table below.

Electric compressor

(—)

Resistance (

Ω)

Connector

Terminal

F252

7

Ground

Always

2 M

Ω or higher

8